Energy of mass

In 1905, Albert Einstein postulates that the Masse is one of the forms which the energy can take. Any system at rest, of mass m , thus has a energy of mass E given by the famous relation of Einstein:

E = mc ²

with:

E: the energy, in joule S (J);
m: the Mass, in Kilogram S (kg);
C: the Celerity or the Speed of light in the vacuum, in meters a second (C ≈ 3.0 × 10 8 m/s).

This relation is called relation of equivalence between the mass and energy . It involves that any variation of mass D m of a system at rest corresponds to a variation of its energy of mass D E such as:

$\ mathrm of = c^2 \ mathrm DM \,$

If the mass of a system at rest decreases, its energy of mass decreases too. Energy D E is released by the system and is provided to the external medium. If the mass of a system at rest increases, its energy of mass increases too. Energy D E is then provided to the system by the external medium.

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